51. Muraoka, Y., T. Sugiyama, T. Sato, S. Fukao, T. Tsuda, and S. Kato, Interpretation of Layered Structure in Mesospheric VHF Echoes Induced by an Inertia Gravity Wave, Radio Sci., 24, 393-406, 1989.

52. Muraoka, Y., T. Sugiyama, K. Kawahira, T. Sato, T. Tsuda, S. Fukao, and S. Kato, MU Radar Observation of a Mesospheric Gravity Wave Breaking Caused by Convective Instability, Adv. Space Res, 10, 175-178, 1990.

53. Ushimaru, S., and H. Tanaka, Characteristics of Internal Inertial Gravity Waves and Inertial Waves in the Lower Stratosphere Observed by the MU Radar, J. Meteor. Soc. Japan, 68, 1-18, 1990.

54. Yamanaka, M. D., Picture of the Global Field of "Quasi-Monochromatic'' Internal Gravity Waves Observed by Stratospheric Balloons and MST Radars, Adv. Space Res., 10, 185-188, 1990.

55. VanZandt, T. E., S. A. Smith, T. Tsuda, D. C. Fritts, T. Sato, S. Fukao, and S. Kato, Studies of Velocity Fluctuations in the Lower Atmosphere Using the MU Radar: I. Azimuthal Anisotropy, J. Atmos. Sci., 47, 39-50, 1990.

56. Fritts, D. C., T. Tsuda, T. E. VanZandt, S. A. Smith, T. Sato, S. Fukao, and S. Kato, Studies of Velocity Fluctuations in the Lower Atmosphere Using the MU Radar: II. Momentum Fluxes and Energy Densities, J. Atmos. Sci., 47, 51-66, 1990.

57. Fukao, S., T. Sato, T. Tsuda, M. Yamamoto, M. D. Yamanaka, and S. Kato, The MU Radar: New Capabilities and System Calibrations, Radio. Sci., 25, 477-485, 1990.

58. Hocking, W. K., S. Fukao, T. Tsuda, M. Yamamoto, T. Sato, and S. Kato, Aspect Sensitivity of Stratospheric VHF Radiowave Scatterers, Particularly above 15 km Altitude, Radio Sci., 25, 613-627, 1990.

59. Van Baelen, J. S., T. Tsuda, A. D. Richmond, S. K. Avery, S. Kato, S. Fukao, and M. Yamamoto, Comparison of VHF Doppler Beam Swinging and Spaced Antenna Observations with the MU Radar: First Results, Radio Sci., 25, 629-640, 1990.

60. Sato, T., H. Doji, H. Iwai, I. Kimura, S. Fukao, M. Yamamoto, T. Tsuda, and S. Kato, Computer Processing for Deriving Drop-Size Distributions and Vertical Air Velocities from VHF Doppler Radar Spectra, Radio Sci., 25, 961-973, 1990.

61. Masuda, Y., J. Awaka, K. Okamoto, T. Tsuda, S. Fukao, and S. Kato, Echo Power Loss with RASS (Radio Acoustic Sounding System) due to Defocussing Effects by Distorted Acoustic Wave Front, Radio Sci., 25, 975-981, 1990.

62. Tsuda, T., S. Kato, T. Yokoi, T. Inoue, M. Yamamoto, T. E. VanZandt, S. Fukao, and T. Sato, Gravity Waves in the Mesosphere Observed with the MU Radar, Radio Sci., 25, 1005-1018, 1990.

63. Yang, P., Da-ren Lu, W. Li, B. Wu, S. Fukao, M. Yamamoto, T. Tsuda, and S. Kato, Chaotic Features of the Atmospheric Motions Near the Tropopause Revealed by MU Radar Observation: Case Study, Radio Sci., 25, 1065-1070, 1990.

64. Oliver, W. L., S. Fukao, T. Takami, M. Yamamoto, T. Tsuda, T. Nakamura, and S. Kato, Thermospheric Meridional Winds Measured by the MU Radar, J. Geophys. Res., 95, 7683-7692, 1990.

65. Tsuda, T., Y. Murayama, M. Yamamoto, S. Kato, and S. Fukao, Seasonal Variation of Momentum Flux in the Mesosphere Observed with the MU Radar, Geophys. Res. Lett., 17, 725-728, 1990.

66. Muraoka, Y., S. Fukao, T. Sugiyama, M. Yamamoto, T. Nakamura, T. Tsuda, and S. Kato, Frequency Spectra of Mesospheric Wind Fluctuations Observed With the MU Radar, Geophys. Res. Lett., 1897-1900, 1990.

67. Reddy, C. A., S. Fukao, T. Takami, M. Yamamoto, T. Tsuda, T. Nakamura, and S. Kato, A MU Radar-Based Study of Mid-Latitude F-Region Response to a Geomagnetic Disturbance, J. Geophys. Res., 95, 21077-21094, 1990.

68. Palmer, R. D., R. F. Woodman, S. Fukao, M. F. Larsen, T. Tsuda, and S. Kato, Frequency Domain Interferometry Observations of Tropo/Stratospheric Scattering Layers Using the MU Radar: Description and First Results, Geophys. Res. Lett., 17, 2189-2192, 1990.

69. Palmer, R. D., S. Fukao, R. F. Woodman, T. Tsuda, and S. Kato, Three-Antenna Post-Statistic Steering Using the MU Radar, Radio Sci., 25, 1105-1110, 1990.

70. Sato, K., Vertical Wind Disturbances in the Troposphere and Lower Stratosphere Observed by the MU Radar, J. Atmos. Sci, 47, 2803-2817, 1990.

71. Reddy, C. A., A. Nishida, S. Fukao, and V. V. Somayajulu, Magnetospheric Substorm-Related Electric Fields in the Ionosphere: Discrepancy of an Observation with Model Predictions, Geophys. Res. Lett., 17, 2333-2336, 1990.

72. Fukao, S., M. C. Kelley, T. Shirakawa, T. Takami, M. Yamamoto, T. Tsuda, and S. Kato, Turbulent Upwelling of the Mid-Latitude Ionosphere: 1. Observational Results by the MU Radar, J. Geophys. Res., 96, 3725-3746, 1991.

72. Kelley, M. C., and S. Fukao, Turbulent Upwelling of the Mid-Latitude Ionosphere: 2. Theoretical Framework, J. Geophys. Res., 96, 3747-3753, 1991.

73. Woodman, R. F., A General Statistical Instrument Theory of Atmosphericand Ionospheric Radars, J. Geophys. Res., 96, 7911-7928, 1991.

74. Sato, T., H. Kayama, A. Furusawa, and I. Kimura, MU Radar Measurements of Orbital Debris, J. Spacecraft and Rockets, 28, 677-682, 1991.

75. Palmer, R. D., M. F. Larsen, R. F. Woodman, S. Fukao, M. Yamamoto, T. Tsuda, and S. Kato, VHF Radar Interferometry Measurements of Vertical Velocity and the Effects of Tilted Refractivity Surfaces on Standard Doppler Measurements, Radio Sci., 26, 417-427, 1991.

76. Zhang, X.-J., X.-Q. Ruan, T. Sato, I. Kimura, S. Fukao, and S. Kato, Profiles of Electron Density in the Lower Ionosphere Observed by the MU Radar, J. Geomag. Geoelectr, 43, 179-187, 1991.

77. Sato, T., N. Ao, M. Yamamoto, S. Fukao, T. Tsuda, and S. Kato, A Typhoon Observed with the MU Radar, Mon. Weather Rev., 119, 755-768, 1991.

78. Fukao, S., M. F. Larsen, M. D. Yamanaka, H. Furukawa, T. Tsuda, and S. Kato, Observations of a Reversal in Long-Term Average Vertical Velocities Near the Jetstream Wind Maximum, Mon. Weather Rev., 119, 1479-1489, 1991.

79. Larsen, M. F., S. Fukao, O. Aruga, M. D. Yamanaka, T. Tsuda, and S. Kato, A Comparison of VHF Radar Vertical Velocity Measurements by a Direct Vertical Beam Method and by a VAD Technique, J. Atmos. Ocean Tech., 8, 766-776, 1991.

80. Fukao, S., W. L. Oliver, Y. Onishi, T. Takami, T. Sato, T. Tsuda, M. Yamamoto, and S. Kato, F Region Seasonal Behavior as Measured by the MU Radar, J. Atmos. Terr. Phys., 53, 599-618, 1991.

81. Takami, T., S. Fukao, W. L. Oliver, S. Kato, T. Tsuda, T. Sato, M. D. Yamanaka, M. Yamamoto, and T. Nakamura, Multiple Beam Observations of Mid-latitude Ionospheric Disturbances by the MU Radar, J. Atmos. Terr. Phys., 53, 773-779, 1991.

82. Yamamoto, M., S. Fukao, T. Tsuda, S. Kato, and R. F. Woodman, Mid-Latitude E-Region Field-Aligned Irregularities Observed with the MU Radar, J. Geophys. Res., 96, 15943-15949, 1991.

83. Nakamura, T., T. Tsuda, M. Tsutsumi, K. Kita, T. Uehara, S. Kato, and S. Fukao, Meteor Wind Observations with the MU Radar, Radio Sci., 26, 857-869, 1991.

84. Fukao, S., and R. D. Palmer, Spatial and Frequency Domain Interferometry Using the MU Radar: A Tutorial and Recent Developments, J. Geomag. Geoelectr., 43, 645-666, 1991.

85. Oliver, W. L., S. Fukao, T. Takami, T. Tsuda, and S. Kato, Four-Beam Measurements of Ionospheric Structure with the MU Radar During the Low-Latitude Auroral Event of 20-23 October 1989, Geophys. Res. Lett., 18, 1975-1978, 1991.

86. Oliver, W. L., T. Takami, S. Fukao, T. Sato, M. Yamamoto, T. Tsuda, T. Nakamura, and S. Kato, Measurements of Ionospheric and Thermospheric Temperatures and Densities with the MU Radar, J. Geophys. Res., 96, 17827-17838, 1991.

87. Woodman, R. F, M. Yamamoto, and S. Fukao, Gravity Wave Modulation of Gradient Drift Instabilities in Mid-Latitude Sporadic-E Irregularities, Geophys. Res. Lett., 18, 1197-1200, 1991.

88. Yamanaka, M. D., Formation of Multiple Tropopause and Stratospheric Inertio-Gravity Waves, Adv. Space Res., 11, 181-190, 1992.

89. Sato, K., Vertical Wind Disturbances in the Afternoon of Mid-SummerRevealed by the MU Radar, Geophys. Res. Lett, 19, 1943-1946, 1992.

90. Larsen, M. F., R. D. Palmer, S. Fukao, R. F. Woodman, M. Yamamoto, T. Tsuda, and S. Kato, An Analysis Technique for Deriving Vector Winds and In-Beam Incidence Angles from Radar Interferometer Measurements, J. Atmos. Ocean Tech., 9, 3-14, 1992.

91. Kuo, F. S., H. Y. Lue, C. M. Huang, C. L. Lo, C. H. Liu, S. Fukao, and Y. Muraoka, A Study of Velocity Fluctuation Spectra in the Lower Atmosphere Using MU Radar, J. Atmos. Terr. Phys., 54, 31-48, 1992.

92. Murayama, Y., T. Tsuda, M. Yamamoto, T. Nakamura, T. Sato, S. Kato, and S. Fukao, Dominant Vertical Scales of Gravity Waves in the Middle Atmosphere Observed with the MU Radar and Rocketsondes, J. Atmos. Terr. Phys., 54,} 339-346, 1992.

93. Yamamoto, M., S. Fukao, T. Ogawa, T. Tsuda, and S. Kato, A Morphological Study on Mid-Latitude E-Region Field-Aligned Irregularities Observed with the MU Radar, J. Atmos. Terr. Phys., 54, 769-777, 1992.

94. May, P. T., S. Fukao, P. J. Neiman, M. W. Kozleski, M. D. Yamanaka, S. Kato, M. Yamamoto, T. Sato and T. Tsuda, MU Radar Observations of the Wind Field in the Vicinity of the Baiu Front during Early July, 1987, Beitr. Phys. Atmosph., 65, 3-11, 1992.

95. Masuda, Y., T. Tsuda, and T. Adachi, Atmospheric Temperature Profiling with a Radio Acoustic Sounding System (RASS), J. Remote Sensing, Japan, 12, 76-81, 1992.

96. Tsuda, T., Remote Sensing of Atmospheric Motions with the MU Radar, A Radio Acoustic Sounding System (RASS), J. Remote Sensing, Japan, 12, 82-87, 1992.

97. Masuda, Y., J. Awaka, K. Nakamura, T. Adachi, and T. Tsuda, Analysis of the Radio Acoustic Sounding System Using a Chirped Acoustic Wave, Radio Sci., 27, 681-691, 1992.

98. Palmer, R. D., S. Fukao, M. F. Larsen, M. Yamamoto, T. Tsuda, and S. Kato, Oblique Frequency Domain Interferometry Measurements Using the Middle and Upper Atmosphere Radar, Radio Sci., 27, 713-720, 1992.

99. Murayama, Y., K.-I. Oyama, T. Tsuda,H. Kanzawa, F. J. Schmidlin, M. Bittner, T. Nakamura, M. D. Yamanaka, S. Fukao, and S. Kato, Rocketsonde Observations of the Middle Atmosphere Dynamics at Uchinoura (31circ, 131circ) during DYANA Campaign. Part I: Outline of Experiments and Background Conditions, J. Geomag. Geoelectr., 44, 995-1007, 1992.

100. Tsuda, T., Y. Murayama, K.-I. Oyama, F. J. Schmidlin, M. Bittner, H. Kanzawa, T. Nakamura, M. D. Yamanaka, S. Fukao, and S. Kato, Rocketsonde Observations of the Middle Atmosphere Dynamics at Uchinoura (31circ,131circ) during DYANA Campaign. Part II: Characteristics of Gravity Waves, J. Geomag. Geoelectr., 44, 1009-1023, 1992.